Bump MaterialDesignThemes.MahApps from 5.3.0 to 5.3.1

---
updated-dependencies:
- dependency-name: MaterialDesignThemes.MahApps
  dependency-version: 5.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/SDAT/SDAT.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="MaterialDesignThemes" Version="5.3.1" />
-    <PackageReference Include="MaterialDesignThemes.MahApps" Version="5.3.0" />
+    <PackageReference Include="MaterialDesignThemes.MahApps" Version="5.3.1" />
     <PackageReference Include="Prism.Unity" Version="9.0.537" />
   </ItemGroup>
   <ItemGroup>